Power-Law Distribution Pattern and Hierarchical Structure Characteristics of Urban Agglomeration Network Linkages
There is a power distribution law for urban networks in urban agglomerations.Under the influence of this law,urban networks are"networks with hierarchical tendencies",and their network structures are necessarily characterized by obvious hierarchical features.First,based on the city gravity model to measure the interconnectedness of cities,the probability distribution law of the strength of inter-city linkages in urban agglomerations is empirically examined,and it is proved that the city network linkages conform to the characteristics of the power law distribution and are scale-invariant.The city network linkages in urban agglomerations is a scale-invariant network that follows a power-law distribution.Then,the hierarchical structure of the city network of the urban agglomeration was divided and comparatively analysed based on the head/tail breaks method.Although there are significant differences in the size,strength and development of the city networks of different urban agglomerations,and the spatial patterns of strong linkages also differ in direction,their network structures all have obvious"core-edge"hierarchical characteristics.
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